CN113122782A - Stainless steel for pump head body and preparation method thereof - Google Patents
Stainless steel for pump head body and preparation method thereof Download PDFInfo
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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Abstract
The invention discloses stainless steel for a pump head body, which comprises the following raw materials of less than or equal to 0.04 percent of C, less than or equal to 0.60 percent of Si, Mn: 0.50-1.00%, S is less than or equal to 0.008%, P is less than or equal to 0.010%, Cr: 14.00-16.00%, Ni: 3.50-5.50%, Mo: 1.50-2.00%, N: 0.14-0.20%, Cu: 0.20-0.40%, Ti: 0.20-0.40%, and the balance of Fe and inevitable impurities. The invention also discloses a preparation method of the stainless steel. According to the invention, by screening and optimizing the chemical components of the stainless steel and seeking reasonable smelting, forging and heat treatment processes for the stainless steel, the stainless steel with high strength and hardness, excellent impact toughness, good corrosion resistance and low alloy cost is finally obtained, and the requirement of the pump head body material of the large-scale intelligent mine emulsion pump station is met.
Description
Technical Field
The invention belongs to the field of metallurgy, and particularly relates to stainless steel for a pump head body and a preparation method thereof.
Background
The mining emulsion pump station is one of key devices of a modernized high-yield high-efficiency fully-mechanized coal mining face in a coal mine, is an important power unit for ensuring the safe and reliable operation of the fully-mechanized coal mining face, and is a heart and hydraulic power source in the whole coal mine. The mine emulsion pump station can be divided into a power end and a hydraulic end on the whole. The power end part mainly comprises a box body, a crankshaft, a connecting rod slide block, a reduction gear box and the like. The box body adopts a high-strength cast iron integral box type structure, and lubricating oil is stored in the box body to realize splash lubrication on moving parts. The crankshaft adopts a two-end supporting mode. The hydraulic end mainly comprises a plunger, a cylinder sleeve assembly, a pump head body and the like.
The pump head body is made of split integral steel forging, a liquid suction valve, a liquid discharge valve and liquid discharge holes are formed in the pump head body, and the liquid discharge pipe connects the converging holes of the liquid discharge holes of the pump heads. Because the pump head body is provided with the through holes in three directions, when the pump head body works, each hole is simultaneously impacted and corroded by uneven and pulse alternating load, the maximum pressure is 40MPa at present, and the maximum flow is 1250 liters per minute; meanwhile, 3-5 wt% of emulsion aqueous solution is output and recovered by the mining emulsion pump station, due to the limitation of underground conditions of a coal mine, the water quality is poor, and the emulsion aqueous solution often contains a large amount of over-standard chloride ions, and the chloride ions have corrosion damage capability to alloy structural steel and austenitic stainless steel, so that when the emulsion pump station works, a pump head body is subjected to double damage of alternating stress and chloride ion corrosion, namely stress corrosion, the inner hole of the pump head body is corroded and cracked, and the shortest service life is only 50 days.
Along with the improvement of the automation and the intelligence degree of coal mine machinery, due to the limitation of underground conditions of the coal mine, the pump head body is heavy (weight is 1000 Kg-1500 Kg), the assembly, disassembly and maintenance are very difficult and inconvenient, and the requirements and the expectations of coal mine users on the product quality and the service life are higher and higher. Because the pump head body in the mining emulsion pump station has the characteristics of large weight and multiple internal three-dimensional crossed holes, the strengthening and toughening can not be realized through a control cooling and conventional heat treatment strengthening way, and meanwhile, the internal hole system can not achieve the purpose of corrosion resistance through a coating or plating technology, so that the strengthening and toughening performance of the pump head body are ensured, cracking is prevented, the corrosion resistance of the pump head body is also ensured, the internal hole system is not corroded and rusted in the using process, and the requirement of the pump head body is met urgently by a novel stainless steel.
Disclosure of Invention
Therefore, the invention aims to solve the technical problems of poor toughness and corrosion resistance of the existing material for the pump head body, and provides the stainless steel for the pump head body and the preparation method thereof.
Therefore, the invention adopts the following technical scheme:
the invention provides stainless steel for a pump head body, which comprises the following elements in percentage by mass:
c is less than or equal to 0.04 percent, Si is less than or equal to 0.60 percent, Mn: 0.50-1.00%, S is less than or equal to 0.008%, P is less than or equal to 0.010%, Cr: 14.00-16.00%, Ni: 3.50-5.50%, Mo: 1.50-2.00%, N: 0.14-0.20%, Cu: 0.20-0.40%, Ti: 0.20-0.40%, and the balance of Fe and inevitable impurities.
Preferably, in the stainless steel, O is less than or equal to 25ppm, and H is less than or equal to 1.5 ppm.
The invention also provides a preparation method of the stainless steel for the pump head body, which comprises the following steps:
s1: designing and batching according to the composition of the stainless steel, and smelting the batching to obtain a mixed steel ingot;
s2: remelting and refining the mixed steel ingot obtained by smelting to obtain a refined steel ingot;
s3: forging the refined steel ingot by a press to obtain rough stainless steel;
s4: and carrying out heat treatment on the rough stainless steel to obtain a finished stainless steel product.
Further, the heat treatment in step S4 includes four steps of homogenizing annealing, refining normalizing, quenching and tempering, and aging treatment, which are performed in sequence.
Preferably, the first and second electrodes are formed of a metal,
the homogenization annealing treatment is that the furnace is cooled to the room temperature after the heat preservation is carried out for 4 to 5 hours at 1050-;
the refining normalizing treatment is air cooling to room temperature after heat preservation at 1030-1050 ℃ for 3-4 h;
the quenching and tempering treatment comprises the steps of preheating for 3 hours at 600 ℃, then heating to 990-;
the aging treatment is to carry out heat preservation at 200-220 ℃ for 3-4h and then air-cool the mixture to room temperature.
Further, in the step S3, the press forging is that the refined steel ingot is heated to 1200 ℃, cogging, upsetting, drawing out and forging are performed in a 6000 ton oil press, and after forging, the refined steel ingot is placed in an electric furnace to be cooled to 850 ℃ to obtain the rough stainless steel, wherein the forging ratio of the forging is not less than 8.
The smelting in the step S1 is arc smelting, a general electric arc furnace is used for smelting mixed steel ingots, and the electric furnace smelting process comprises the following steps: electric furnace steel making, external refining, vacuum degassing, casting electroslag blank and blank annealing, wherein the annealing treatment is furnace cooling to room temperature after heat preservation at 1050-;
in the step S2, the remelting and refining are electroslag remelting and refining of the mixed steel ingot smelted by the arc furnace under the protection of argon, the steel ingot is placed in a heat-insulating cylinder and slowly cooled to room temperature after refining, and the electroslag steel ingot is annealed, wherein the annealing treatment is furnace cooling to room temperature after heat insulation at 1050-; electroslag steel ingot cleaning (flaw detection) aims at further removing impurities and refining grains.
The technical scheme of the invention has the following advantages:
1. the stainless steel provided by the invention is composed of elements with specific proportions, and the components have different functions: because the content of carbon (C) is relatively low, the material can ensure excellent impact toughness and plasticity and good corrosion resistance; the appropriate content of silicon (Si) and manganese (Mn) is beneficial to generating solid solution strengthening, the effect of solid solution strengthening is reduced when the content is too low, the comprehensive strengthening effect of other alloy elements can be greatly influenced, and the impact toughness and plasticity can be reduced when the content is too high; chromium (Cr) can remarkably improve the strength, hardness and wear resistance in cast steel, mainly improve the corrosion resistance of materials, but reduce the plasticity and toughness too much; the nickel (Ni) can improve the strength of the steel and keep good plasticity and toughness; molybdenum (Mo) can refine grains of the material and improve mechanical properties; meanwhile, chromium (Cr) and molybdenum (Mo) form micro-alloy carbon nitride in dispersion distribution with carbon and nitrogen atoms in the material, so that a good aging strengthening effect is achieved, a small amount of chromium, nickel and molybdenum alloy elements are added into the material at the same time, and the comprehensive effect of the micro-alloy carbon nitride is far greater than the sum of the independent effects; the other important function of the molybdenum (Mo) is to greatly improve the corrosion resistance which is 3 times that of the chromium (Cr); the content of nitrogen (N) is low, but the nitrogen (N) can increase the stability of austenite, improve the strength, corrosion resistance and oxidation resistance of steel, and simultaneously does not reduce the intergranular corrosion resistance of the austenitic stainless steel, and the chlorine ion corrosion resistance is 16 times of the action of chromium (Cr) elements; the corrosion resistance of the stainless steel can be improved by adding chromium into copper (Cu), and the Cu2+The enrichment on the active surface inhibits the anodic dissolution of the stainless steel, and the difficulty of forming a passivation film is related to the content of Cu in the matrix; titanium (Ti) can prevent the crystal grains from growing and play a role in refining the crystal grains, and titanium, niobium (Nb) and niobium (Nb) are simultaneously usedThe carbon has strong affinity, can generate stable TiC and NbC and is uniformly distributed in the matrix so as to avoid the combination of the carbon and the chromium to form chromium carbide, thereby reducing the generation of a grain boundary chromium-poor area and improving the grain boundary corrosion resistance of the stainless steel. Phosphorus (P), sulfur (S), oxygen (O) and hydrogen (H) are all harmful elements in stainless steel, and the lower the content, the better. Phosphorus (P) and sulfur (S) are impurity elements in stainless steel, which degrade corrosion performance, and thus need to be minimized. Oxygen (O) is a harmful element in stainless steel, interacts with other elements to form non-metallic inclusions, reduces toughness and corrosion resistance of stainless steel, and also becomes a fatigue source, generates stress concentration, and causes breakage of the pump head body. Hydrogen (H) is a component of stainless steel which, in addition to embrittling the material, can also cause other damage such as blistering and white spots on the surface under certain conditions.
2. In the preparation method, the heat treatment has four steps of treatment, and the high-temperature homogenizing annealing treatment aims at eliminating forging tissues, macro segregation and micro segregation of pure high-strength and high-toughness corrosion-resistant stainless steel through homogenizing annealing treatment, so that the components of the forging are homogenized and refined to obtain crystal grains, and the stress of the forging is eliminated; through the refining normalizing treatment, the stress of the forged piece is further eliminated, the structure is homogenized and the grains are refined, and a certain amount of strong carbon nitrogen compound elements are dissolved in the uniform and fine ferrite; through quenching and tempering, the high-strength high-hardness martensite is completely converted into low-carbon martensite with high strength and high hardness, a large amount of alloy elements and carbon and nitrogen compounds are dissolved in solid, solid solution strengthening, phase transformation strengthening and aging strengthening are simultaneously generated, tissue preparation is made during high-temperature tempering, and the tissue is converted into uniform tempered sorbite after the high-temperature tempering, so that the high-strength high-hardness martensite has good comprehensive mechanical property, namely high strength and hardness, and good plasticity and toughness are matched; finally, various welding stresses and machining residual stresses after rough machining are further eliminated through aging treatment.
3. The preparation method adopts the press for forging, the inner part and the surface of the forging are simultaneously deformed during forging, the forging is uniform and thorough, the internal streamline and dendritic crystal tissues of the forging are completely changed, and the banded tissues are eliminated.
4. In the preparation method, the argon protection electroslag remelting refining technology is adopted, so that the content of impurities such as sulfur and phosphorus in the material is reduced, the purity of the material is improved, and the uniformity and the compactness of the material are improved.
5. The method ensures the toughness and plasticity of the material by using the pure material with low carbon content, multi-element alloying, electroslag remelting and refining, cogging and forging by a 6000-ton hydraulic press and optimal heat treatment, and exerting the advantages of solid solution strengthening, martensite structure strengthening, micro-alloy carbon nitride aging strengthening, grain refining and the like which are precipitated from martensite and dispersed; the method has the advantages that the argon protection electroslag remelting refining is adopted, the harmful impurities and the ingot defects are reduced, the flow line and the dendritic crystal structure inside the forge piece are changed through the press forging, the banded structure is eliminated, and the forged structure, the macro segregation, the micro segregation and the like are further eliminated through the high-temperature homogenization annealing treatment; the pump head body is completely quenched by reasonably proportioning alloy elements such as chromium, manganese, nickel, molybdenum and the like; the chlorine ion corrosion resistance of the stainless steel is realized by adding chromium, molybdenum, nitrogen and copper and reasonably proportioning; according to the invention, by screening and optimizing the formula of the chemical components of the cast steel and seeking a reasonable smelting and forging mode and an optimal heat treatment process for the pump head body material, the stainless steel with high strength and hardness, excellent impact toughness, good corrosion resistance and low alloy cost is finally obtained, and the requirement of the pump head body material of the large-scale intelligent mine emulsion pump station is met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a metallographic structure diagram of a stainless steel produced in example 1 of the present invention;
FIG. 2 is a metallographic structure diagram of a stainless steel produced in example 2 of the present invention;
FIG. 3 is a metallographic structure diagram of a stainless steel produced in example 3 of the present invention;
FIG. 4 is a metallographic structure diagram of a stainless steel produced in example 4 of the present invention;
FIG. 5 is a view showing a used appearance of a pump head body in test example 2 of the present invention made using the stainless steel of example 1;
FIG. 6 is a view showing a pump head body made of a conventional stainless steel according to test example 2 of the present invention after use;
FIG. 7 is a view showing a pump head body made of a conventional stainless steel according to test example 2 of the present invention after use; .
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The specific experimental procedures or conditions are not shown in the examples, and the procedures or conditions of the conventional experimental procedures described in the literature in the field can be performed, and all the reagents are commercially available standard reagents.
The following specific examples are further illustrative of the present invention, and the examples do not exemplify all the embodiments of the present invention, but only some of the embodiments are exemplified, and the specific examples are as follows:
example 1
The embodiment provides stainless steel for a pump head body, which consists of the following elements in percentage by mass: c: 0.03%, Si: 0.50%, Mn: 0.95%, S: 0.008%, P: 0.010%, Cr: 14.90%, Ni: 4.50%, Mo: 1.82%, N: 0.18%, Cu: 0.36%, Ti: 0.25%, and the balance of Fe and inevitable impurities.
The preparation method specifically comprises the following steps:
(1) the method comprises the following steps of proportioning according to the composition design requirement of stainless steel, smelting by using a general electric arc furnace, wherein the electric arc furnace smelting process is a conventional process and comprises the following steps: electric furnace steel making, external refining, vacuum degassing, casting electroslag blank and blank annealing, wherein the annealing treatment is heat preservation at 1050 ℃ for 4 hours, and furnace cooling to room temperature to finally obtain a mixed steel ingot;
(2) electroslag remelting refining is carried out on the mixed steel ingot smelted by an electric arc furnace under the protection of argon, the steel ingot is placed in a heat-insulating cylinder and slowly cooled to room temperature after refining, and the electroslag steel ingot is annealed, wherein the annealing treatment is that the furnace is cooled to room temperature after the heat is preserved for 4 hours at 1050 ℃, and finally the refined steel ingot is obtained;
(3) heating the refined steel ingot to 1200 ℃, cogging, upsetting, drawing out and forging in a 6000-ton oil press, putting the steel ingot into an electric furnace after forging, cooling to 850 ℃, and obtaining rough stainless steel according to the forging ratio of more than or equal to 8;
(4) carrying out heat treatment on the crude stainless steel, wherein the heat treatment comprises four steps of refining and normalizing treatment, quenching and tempering treatment and aging treatment, and the four steps comprise:
the homogenizing annealing treatment is to keep the temperature at 1050 ℃ for 4 hours and then cool the furnace to room temperature;
the refining normalizing treatment is to carry out heat preservation at 1030 ℃ for 3 hours and then air-cool the mixture to room temperature;
the quenching and tempering treatment comprises the steps of preheating for 3 hours at 600 ℃, then heating to 990 ℃, preserving heat for 4 hours, then placing in quenching oil, cooling to room temperature, heating to 620 ℃, preserving heat for 4 hours, and then cooling to room temperature;
and the aging treatment is to carry out heat preservation at 220 ℃ for 3h and then air-cool the stainless steel to room temperature, thus finally obtaining a stainless steel finished product.
The metallographic structure of the stainless steel obtained in this example is a structure of "tempered sorbite having a low-carbon lath martensite form" as shown in fig. 1, and the structure is uniform and dense.
Example 2
The embodiment provides stainless steel for a pump head body, which consists of the following elements in percentage by mass: c: 0.03%, Si: 0.55%, Mn: 0.90%, S: 0.008%, P: 0.010%, Cr: 15.50%, Ni: 4.60%, Mo: 1.70%, N: 0.20%, Cu: 0.31%, Ti: 0.28%, and the balance of Fe and inevitable impurities.
The preparation method specifically comprises the following steps:
(1) the method comprises the following steps of proportioning according to the composition design requirement of stainless steel, smelting by using a general electric arc furnace, wherein the electric arc furnace smelting process is a conventional process and comprises the following steps: electric furnace steel making, external refining, vacuum degassing, casting electroslag blank and blank annealing, wherein the annealing treatment is heat preservation at 1080 ℃ for 5 hours, and then furnace cooling is carried out to room temperature, and finally mixed steel ingot is obtained;
(2) electroslag remelting refining is carried out on the mixed steel ingot smelted by an electric arc furnace under the protection of argon, the steel ingot is placed in a heat-insulating cylinder and slowly cooled to room temperature after refining, and the electroslag steel ingot is annealed, wherein the annealing treatment is that the furnace is cooled to room temperature after heat insulation is carried out for 5 hours at 1080 ℃, and finally the refined steel ingot is obtained;
(3) heating the refined steel ingot to 1200 ℃, cogging, upsetting, drawing out and forging in a 6000-ton oil press, putting the steel ingot into an electric furnace after forging, cooling to 850 ℃, and obtaining rough stainless steel according to the forging ratio of more than or equal to 8;
(4) carrying out heat treatment on the crude stainless steel, wherein the heat treatment comprises four steps of refining and normalizing treatment, quenching and tempering treatment and aging treatment, and the four steps comprise:
the homogenization annealing treatment is to carry out heat preservation at 1080 ℃ for 5 hours and then cool the furnace to room temperature;
the refining normalizing treatment is to carry out heat preservation at 1050 ℃ for 3h and then air-cool the mixture to room temperature;
the quenching and tempering treatment comprises the steps of preheating for 3 hours at 600 ℃, then heating to 990 ℃, preserving heat for 4 hours, then placing in quenching oil, cooling to room temperature, heating to 620 ℃, preserving heat for 4 hours, and then cooling to room temperature;
and the aging treatment is to carry out heat preservation at 200 ℃ for 4 hours and then air-cool the stainless steel to room temperature, thus finally obtaining a stainless steel finished product.
The metallographic structure of the stainless steel obtained in this example is a structure of "tempered sorbite having a low-carbon lath martensite form" as shown in fig. 2, and the structure is uniform and dense.
Example 3
The embodiment provides stainless steel for a pump head body, which consists of the following elements in percentage by mass: c: 0.02%, Si: 0.48%, Mn: 0.98%, S: 0.008%, P: 0.009%, Cr: 15.00%, Ni: 4.80%, Mo: 1.72%, N: 0.20%, Cu: 0.39%, Ti: 0.23%, and the balance of Fe and inevitable impurities.
The preparation method specifically comprises the following steps:
(1) the method comprises the following steps of proportioning according to the composition design requirement of stainless steel, smelting by using a general electric arc furnace, wherein the electric arc furnace smelting process is a conventional process and comprises the following steps: electric furnace steel making, external refining, vacuum degassing, casting electroslag blank and blank annealing, wherein the annealing treatment is heat preservation at 1060 ℃ for 4 hours, and then furnace cooling is carried out to room temperature, and finally mixed steel ingot is obtained;
(2) electroslag remelting refining is carried out on the mixed steel ingot smelted by an electric arc furnace under the protection of argon, the steel ingot is placed in a heat-insulating cylinder and slowly cooled to room temperature after refining, and the electroslag steel ingot is annealed, wherein the annealing treatment is that the furnace is cooled to room temperature after heat preservation is carried out for 4 hours at 106 ℃, and finally the refined steel ingot is obtained;
(3) heating the refined steel ingot to 1200 ℃, cogging, upsetting, drawing out and forging in a 6000-ton oil press, putting the steel ingot into an electric furnace after forging, cooling to 850 ℃, and obtaining rough stainless steel according to the forging ratio of more than or equal to 8;
(4) carrying out heat treatment on the crude stainless steel, wherein the heat treatment comprises four steps of refining and normalizing treatment, quenching and tempering treatment and aging treatment, and the four steps comprise:
the homogenizing annealing treatment is to carry out heat preservation at 1060 ℃ for 4 hours and then furnace cooling to room temperature;
the refining normalizing treatment is to carry out heat preservation at 1040 ℃ for 3h and then air-cool the mixture to room temperature;
the thermal refining treatment comprises the steps of preheating for 3 hours at 600 ℃, then heating to 1000 ℃, preserving heat for 4 hours, then placing in quenching oil, cooling to room temperature, heating to 630 ℃, preserving heat for 4 hours, and then cooling to room temperature;
and the aging treatment is to carry out heat preservation at 210 ℃ for 4 hours and then air-cool the stainless steel to room temperature, thus finally obtaining a stainless steel finished product.
The metallographic structure of the stainless steel obtained in this example is a structure of "tempered sorbite having a low-carbon lath martensite form" as shown in fig. 3, and the structure is uniform and dense.
Example 4
The embodiment provides stainless steel for a pump head body, which consists of the following elements in percentage by mass: c: 0.03%, Si: 0.46%, Mn: 0.98%, S: 0.008%, P: 0.010%, Cr: 15.40%, Ni: 4.90%, Mo: 1.80%, N: 0.19%, Cu: 0.30%, Ti: 0.25%, and the balance of Fe and inevitable impurities.
The preparation method specifically comprises the following steps:
(1) the method comprises the following steps of proportioning according to the composition design requirement of stainless steel, smelting by using a general electric arc furnace, wherein the electric arc furnace smelting process is a conventional process and comprises the following steps: electric furnace steel making, external refining, vacuum degassing, casting electroslag blank and blank annealing, wherein the annealing treatment is heat preservation at 1070 ℃ for 5 hours, and furnace cooling to room temperature to finally obtain a mixed steel ingot;
(2) electroslag remelting refining is carried out on the mixed steel ingot smelted by an electric arc furnace under the protection of argon, the steel ingot is placed in a heat-insulating cylinder and slowly cooled to room temperature after refining, and electroslag steel ingot annealing is carried out, wherein the annealing treatment is carried out by keeping the temperature of 1070 ℃ for 4 hours and then cooling the furnace to room temperature, and finally the refined steel ingot is obtained;
(3) heating the refined steel ingot to 1200 ℃, cogging, upsetting, drawing out and forging in a 6000-ton oil press, putting the steel ingot into an electric furnace after forging, cooling to 850 ℃, and obtaining rough stainless steel according to the forging ratio of more than or equal to 8;
(4) carrying out heat treatment on the crude stainless steel, wherein the heat treatment comprises four steps of refining and normalizing treatment, quenching and tempering treatment and aging treatment, and the four steps comprise:
the homogenization annealing treatment is to carry out heat preservation at 1070 ℃ for 4 hours and then carry out furnace cooling to room temperature;
the refining normalizing treatment is to carry out heat preservation at 1030 ℃ for 3 hours and then air-cool the mixture to room temperature;
the quenching and tempering treatment comprises the steps of preheating for 3 hours at 600 ℃, then heating to 990 ℃, preserving heat for 5 hours, then placing in quenching oil, cooling to room temperature, heating to 620 ℃, preserving heat for 5 hours, and then cooling to room temperature;
and the aging treatment is to carry out heat preservation at 200 ℃ for 4 hours and then air-cool the stainless steel to room temperature, thus finally obtaining a stainless steel finished product.
The metallographic structure of the stainless steel obtained in this example is a structure of "tempered sorbite having a low-carbon lath martensite form" as shown in fig. 4, and the structure is uniform and dense.
Comparative example 1
The comparative example provides stainless steel for a pump head body, which consists of the following elements in percentage by mass: c: 0.015%, Si: 0.45%, Mn: 0.99%, S: 0.008%, P: 0.010%, Cr: 13.40%, Ni: 2.90%, Mo: 0.10%, N: 0.10%, Cu: 0.29%, Ti: 0.20%, and the balance of Fe and inevitable impurities.
The preparation method specifically comprises the following steps:
(1) the method comprises the following steps of proportioning according to the composition design requirement of stainless steel, smelting by using a general electric arc furnace, wherein the electric arc furnace smelting process is a conventional process and comprises the following steps: electric furnace steel making, external refining, vacuum degassing, casting electroslag blank and blank annealing, wherein the annealing treatment is heat preservation at 1050 ℃ for 4 hours, and furnace cooling to room temperature to finally obtain a mixed steel ingot;
(2) electroslag remelting refining is carried out on the mixed steel ingot smelted by an electric arc furnace under the protection of argon, the steel ingot is placed in a heat-insulating cylinder and slowly cooled to room temperature after refining, and the electroslag steel ingot is annealed, wherein the annealing treatment is that the furnace is cooled to room temperature after the heat is preserved for 4 hours at 1050 ℃, and finally the refined steel ingot is obtained;
(3) heating the refined steel ingot to 1200 ℃, cogging, upsetting, drawing out and forging in a 6000-ton oil press, putting the steel ingot into an electric furnace after forging, cooling to 850 ℃, and obtaining rough stainless steel according to the forging ratio of more than or equal to 8;
(4) carrying out heat treatment on the crude stainless steel, wherein the heat treatment comprises four steps of refining and normalizing treatment, quenching and tempering treatment and aging treatment, and the four steps comprise:
the homogenizing annealing treatment is to keep the temperature at 1050 ℃ for 4 hours and then cool the furnace to room temperature;
the refining normalizing treatment is to carry out heat preservation at 1030 ℃ for 3 hours and then air-cool the mixture to room temperature;
the quenching and tempering treatment comprises the steps of preheating for 3 hours at 600 ℃, then heating to 990 ℃, preserving heat for 4 hours, then placing in quenching oil, cooling to room temperature, heating to 620 ℃, preserving heat for 4 hours, and then cooling to room temperature;
and the aging treatment is to carry out heat preservation at 220 ℃ for 3h and then air-cool the stainless steel to room temperature, thus finally obtaining a stainless steel finished product.
Comparative example 2
The comparative example provides stainless steel for a pump head body, which consists of the following elements in percentage by mass: c: 0.03%, Si: 0.50%, Mn: 0.95%, S: 0.008%, P: 0.010%, Cr: 14.90%, Ni: 4.50%, Mo: 1.82%, N: 0.18%, Cu: 0.36%, Ti: 0.25%, and the balance of Fe and inevitable impurities. The difference from example 1 is in the heat treatment method used in the preparation method.
The preparation method specifically comprises the following steps:
(1) the method comprises the following steps of proportioning according to the composition design requirement of stainless steel, smelting by using a general electric arc furnace, wherein the electric arc furnace smelting process is a conventional process and comprises the following steps: electric furnace steel making, external refining, vacuum degassing, casting electroslag blank and blank annealing, wherein the annealing treatment is heat preservation at 1050 ℃ for 4 hours, and furnace cooling to room temperature to finally obtain a mixed steel ingot;
(2) electroslag remelting refining is carried out on the mixed steel ingot smelted by an electric arc furnace under the protection of argon, the steel ingot is placed in a heat-insulating cylinder and slowly cooled to room temperature after refining, and the electroslag steel ingot is annealed, wherein the annealing treatment is that the furnace is cooled to room temperature after the heat is preserved for 4 hours at 1050 ℃, and finally the refined steel ingot is obtained;
(3) heating the refined steel ingot to 1200 ℃, cogging, upsetting, drawing out and forging in a 6000-ton oil press, putting the steel ingot into an electric furnace after forging, cooling to 850 ℃, and obtaining rough stainless steel according to the forging ratio of more than or equal to 8;
(4) and (2) carrying out heat treatment on the rough stainless steel, wherein the heat treatment comprises the steps of carrying out homogenization annealing treatment on furnace cooling after keeping the temperature at 1080 ℃ for 4.5h, carrying out normalizing treatment on the furnace cooling after keeping the temperature at 1050 ℃ for 4.5h, preheating at 600 ℃ for 4h, then heating to 1050 ℃, keeping the temperature for 4.5h, cooling to room temperature in No. 20 quenching oil, immediately carrying out low-temperature tempering treatment on the furnace cooling after keeping the temperature at 220 ℃ for 4h, and finally obtaining a stainless steel product.
The metallographic structure of the stainless steel obtained by the comparative example is a low-carbon lath martensite structure, and the structure is uniform and compact.
Test example 1
The stainless steels of examples 1-4 and comparative examples 1-2 of the present application were tested for their performance and the results are shown in table 1 below:
TABLE 1 Performance test data for stainless steels of examples 1-4 and comparative examples 1-2
As can be seen from Table 1, the stainless steels obtained in examples 1 to 4 of the present invention have excellent strength properties, excellent toughness, and relatively strong resistance to chloride ion pitting corrosion. The stainless steel in the comparative example 1 has a certain reduction in the contents of chromium, nickel, molybdenum and nitrogen due to different element proportions, and compared with the examples, the stainless steel in the comparative example 1-4 has slightly different obdurability and hardenability, but has poor resistance to chloride ion point corrosion; in the stainless steel in the comparative example 2, different heat treatment processes are used in the preparation method, quenching and low-temperature tempering are performed, the obtained structure is tempered lath martensite, although the strength and the hardness are higher, compared with the quenching and tempering treatment in the examples 1 to 4, the stainless steel has lower plasticity and toughness, poorer toughness and overall matching, and poorer comprehensive mechanical properties, and can not meet the actual requirements of the pump head body.
Test example 2
The pump head body made of stainless steel obtained in example 1 of the present invention and the existing pump head body (made of SUS304 stainless steel) were subjected to stress corrosion observation in an emulsion environment containing chloride ions for 200 days, as shown in fig. 5 to 7. It can be seen from fig. 5 that the pump head body manufactured by the present application has no corrosion and cracking, while in fig. 6 and 7, the existing pump head body has severe corrosion and even cracking, which indicates that the stainless steel of the present application is suitable for manufacturing the pump head body.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (7)
1. The stainless steel for the pump head body is characterized by comprising the following elements in percentage by mass:
c is less than or equal to 0.04 percent, Si is less than or equal to 0.60 percent, Mn: 0.50-1.00%, S is less than or equal to 0.008%, P is less than or equal to 0.010%, Cr: 14.00-16.00%, Ni: 3.50-5.50%, Mo: 1.50-2.00%, N: 0.14-0.20%, Cu: 0.20-0.40%, Ti: 0.20-0.40%, and the balance of Fe and inevitable impurities.
2. The stainless steel according to claim 1, wherein O is 25ppm or less and H is 1.5ppm or less.
3. A method for producing the stainless steel of claim 1 or 2, comprising the steps of:
s1: designing and batching according to the composition of the stainless steel, and smelting the batching to obtain a mixed steel ingot;
s2: remelting and refining the mixed steel ingot obtained by smelting to obtain a refined steel ingot;
s3: forging the refined steel ingot by a press to obtain a rough stainless steel forging;
s4: and carrying out heat treatment on the rough stainless steel forging to obtain a stainless steel finished product.
4. The manufacturing method according to claim 3, wherein the heat treatment in step S4 includes four steps of homogenizing annealing, fine normalizing, quenching and tempering, and aging in this order.
5. The production method according to claim 4,
the homogenization annealing treatment is that the furnace is cooled to the room temperature after the heat preservation is carried out for 4 to 5 hours at 1050-;
the refining normalizing treatment is air cooling to room temperature after heat preservation at 1030-1050 ℃ for 3-4 h;
the quenching and tempering treatment comprises the steps of preheating for 3 hours at 600 ℃, then heating to 990-;
the aging treatment is to carry out heat preservation at 200-220 ℃ for 3-4h and then air-cool the mixture to room temperature.
6. The method according to any one of claims 3 to 5, wherein the press forging in step S3 is performed by heating the refined ingot to 1200 ℃, cogging, upsetting, drawing out and forging on a 6000-ton oil press, cooling to 850 ℃ after forging in an electric furnace to obtain the rough stainless steel, and the forging ratio of the forging is not less than 8.
7. The production method according to any one of claims 3 to 6, wherein the melting in step S1 is arc melting;
in the step S2, the remelting and refining is to perform electroslag remelting and refining on the mixed steel ingot obtained by arc melting under the protection of argon gas.
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| CN117626135A (en) * | 2024-01-10 | 2024-03-01 | 浙江中煤机械科技有限公司 | Stainless steel for pump head body and preparation method thereof |
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| CN117626135A (en) * | 2024-01-10 | 2024-03-01 | 浙江中煤机械科技有限公司 | Stainless steel for pump head body and preparation method thereof |
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